Update ruby-rspec-expectations to 3.2.0.

### 3.2.0 / 2015-02-03
[Full Changelog](http://github.com/rspec/rspec-expectations/compare/v3.1.2...v3.2.0)

Enhancements:

* Add `block_arg` method to custom matcher API, which allows you to
  access the block passed to a custom matcher, if there is one.
  (Mike Dalton, #645)
* Provide more detail in failure message of `yield_control` matcher.
  (Jon Rowe, #650)
* Add a shorthand syntax for `chain` in the matcher DSL which assigns values
  for use elsewhere, for example `chain :and_smaller_than, :small_value`
  creates an `attr_reader` for `small_value` (Tom Stuart, #644)
* Provide a more helpful deprecation message when using the `should` syntax.
  (Elia Schito, #663)
* Provide more detail in the `have_attributes` matcher failure message.
  (Jon Rowe,  #668)
* Make the `have_attributes` matcher diffable.
  (Jon Rowe, Alexey Fedorov, #668)
* Add `output(...).to_std(out|err)_from_any_process` as alternatives
  to `output(...).to_std(out|err)`. The latter doesn't work when a sub
  process writes to the named stream but is much faster.
  (Alex Genco, #700)
* Improve compound matchers (created by `and` and `or`) so that diffs
  are included in failures when one or more of their matchers
  are diffable. (Alexey Fedorov, #713)

Bug Fixes:

* Avoid calling `private_methods` from the `be` predicate matcher on
  the target object if the object publicly responds to the predicate
  method. This avoids a possible error that can occur if the object
  raises errors from `private_methods` (which can happen with celluloid
  objects). (@chapmajs, #670)
* Make `yield_control` (with no modifier) default to
  `at_least(:once)` rather than raising a confusing error
  when multiple yields are encountered.
  (Myron Marston, #675)
* Fix "instance variable @color not initialized" warning when using
  rspec-expectations outside of an rspec-core context. (Myron Marston, #689)
* Fix `start_with` and `end_with` to work properly when checking a
  string against an array of strings. (Myron Marston, #690)
* Don't use internally delegated matchers when generating descriptions
  for examples without doc strings. (Myron Marston, #692)


(taca)